Unanswered: Select: use whole model as value?

Unanswered: Select: use whole model as value?

I'm quite new to sencha touch and trying to figure out how to use select form fields with composite models. I have two stores for entities A and B. With A having a field of type B.

Code:

Ext.regModel('A', {
fields: [
{ name: "b", type: "B" }
]
}

The final goal is to use a select field to display all entities of B from the (B-)store as choices and set the selected entity on A. I'm currently at a loss how to accomplish this. It sure seems like a pretty basic and common problem, but I can't find the proper way to configure the select field...